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Which of the following keto esters are n...

Which of the following keto esters are not likely to be obtained by Claisen condensation?

A

B

C

D

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The correct Answer is:
b,d
`beta`-ketoester having an active methylene group is acidic and react with `C_(2)H_(5)Ona` to form enolate salt in IV step of claisen condensation mechanism.
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